Protective relay with second harmonic suppression
CA 1195392 A · Owner: Mitsubishi Denki Kabushiki Kaisha · Inventors: Usui, Masaji; Honma, Akiyoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A relay adapted for protection of a transformer and capable of functioning with certainty upon occurrence of any internal fault in the transformer but not functioning in the case of an inrush current which flows therein at the time of non-load energization or the like. The relay comprises a ratio differential element for comparing the amount of a suppression current with that of a differential current flowing in the transformer, an element for detecting the content proportion of a second-harmonic component in the differential current, a monostable multivibrator for sending an output of a fixed pulse width at the moment of detection of the differential current, an AND circuit for producing …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted October 15, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 15, 2002.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.